Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1991-08-20
1992-11-10
Chin, Stephen
Pulse or digital communications
Spread spectrum
Direct sequence
371 471, H04L 700
Patent
active
051630699
ABSTRACT:
An input pattern is re-timed in a re-timing circuit by an input clock signal of the same frequency as that of the input pattern, and the re-timed input pattern and a reference pattern generated by a reference pattern generator in synchronization with the input clock signal are compared by a digital error detector to detect a mismatch between them. When the error rate dependent on the thus detected mismatch is larger than a predetermined value, an inhibit control circuit inhibits one input clock pulse which is applied to the reference pattern generator, and when the error rate is smaller than the predetermined value, the inhibit control circuit generates a pattern synchronization establishment signal. When the pattern synchronization establishment signal disappears, a one-shot circuit generates a pulse of a certain width, and if the pattern synchronization establishment signal is not generated again in this while, a T flip-flop is triggered by the trailing edge of the pulse of the certain width. The output of the T flip-flop thus triggered is applied to an inverter, which inverts the polarity of the input pulse which is applied to the reference pattern generator and the re-timing circuit.
REFERENCES:
patent: 3824548 (1974-07-01), Sullivan et al.
patent: 4254492 (1981-03-01), McDermott, III
patent: 4445116 (1984-04-01), Grow
patent: 4972442 (1990-11-01), Steierman
patent: 5054035 (1991-10-01), Tarallo et al.
Advantest Corporation
Chin Stephen
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